3 : 0 ] 10
        z=.''
        for_i. 1 + i.y do.
            z =. z , ": i

             if. 0 = 5 | i do.
                  z 1!:2 ]2
                  z =. ''
                  continue.
             end.

             z =. z , ', '
        end.
     i.0 0
   )